Spectrasonics Omnisphere Software Synth - successor to Spectrasonics popular Atmosphere instrument (includes enhanced versions of all the classic Atmosphere sounds). Brand new core library is 10 times the size of Atmosphere and features thousands of completely new and different sounds. Compatible with Mac OS X 10.7 and higher and Windows Vista/7/8 Supports AU, VST, AAX and RTAS plug-in formats.